Dien Bien Prov., Tua Chua Distr., Trung Thu Municipality, Trung Thu Village, around point 21°55′38”N 103°18′05”E.
Highly degraded primary evergreen broadleaved forest on very steep slopes and along remnant ridge composed with solid limestone at elevation 1350-1450 m a.s.l.
Semi-woody vine about 6 m long in rather open rocky slope. Common.
CPC 2185 10 April 2011 Coll.: L.Averyanov, P.K.Loc, N.Q.Hieu, N.T.Vinh.